/*
** $Id: luac.c,v 1.76 2018/06/19 01:32:02 lhf Exp $
** Lua compiler (saves bytecodes to files; also lists bytecodes)
** See Copyright Notice in lua.h
*/

#define luac_c
#define LUA_CORE

#include "lprefix.h"

#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "lua.h"
#include "lauxlib.h"

#include "lobject.h"
#include "lstate.h"
#include "lundump.h"

static void PrintFunction(const Proto *f, int full);
#define luaU_print PrintFunction

#define PROGNAME "luac"        /* default program name */
#define OUTPUT PROGNAME ".out" /* default output file */

static int listing = 0;                 /* list bytecodes? */
static int dumping = 1;                 /* dump bytecodes? */
static int stripping = 0;               /* strip debug information? */
static char Output[] = {OUTPUT};        /* default output file name */
static const char *output = Output;     /* actual output file name */
static const char *progname = PROGNAME; /* actual program name */

static void fatal(const char *message)
{
  fprintf(stderr, "%s: %s\n", progname, message);
  exit(EXIT_FAILURE);
}

static void cannot(const char *what)
{
  fprintf(stderr, "%s: cannot %s %s: %s\n", progname, what, output, strerror(errno));
  exit(EXIT_FAILURE);
}

static void usage(const char *message)
{
  if (*message == '-')
    fprintf(stderr, "%s: unrecognized option '%s'\n", progname, message);
  else
    fprintf(stderr, "%s: %s\n", progname, message);
  fprintf(stderr,
          "usage: %s [options] [filenames]\n"
          "Available options are:\n"
          "  -l       list (use -l -l for full listing)\n"
          "  -o name  output to file 'name' (default is \"%s\")\n"
          "  -p       parse only\n"
          "  -s       strip debug information\n"
          "  -v       show version information\n"
          "  --       stop handling options\n"
          "  -        stop handling options and process stdin\n",
          progname, Output);
  exit(EXIT_FAILURE);
}

#define IS(s) (strcmp(argv[i], s) == 0)

static int doargs(int argc, char *argv[])
{
  int i;
  int version = 0;
  if (argv[0] != NULL && *argv[0] != 0)
    progname = argv[0];
  for (i = 1; i < argc; i++)
  {
    if (*argv[i] != '-') /* end of options; keep it */
      break;
    else if (IS("--")) /* end of options; skip it */
    {
      ++i;
      if (version)
        ++version;
      break;
    }
    else if (IS("-")) /* end of options; use stdin */
      break;
    else if (IS("-l")) /* list */
      ++listing;
    else if (IS("-o")) /* output file */
    {
      output = argv[++i];
      if (output == NULL || *output == 0 || (*output == '-' && output[1] != 0))
        usage("'-o' needs argument");
      if (IS("-"))
        output = NULL;
    }
    else if (IS("-p")) /* parse only */
      dumping = 0;
    else if (IS("-s")) /* strip debug information */
      stripping = 1;
    else if (IS("-v")) /* show version */
      ++version;
    else /* unknown option */
      usage(argv[i]);
  }
  if (i == argc && (listing || !dumping))
  {
    dumping = 0;
    argv[--i] = Output;
  }
  if (version)
  {
    printf("%s\n", LUA_COPYRIGHT);
    if (version == argc - 1)
      exit(EXIT_SUCCESS);
  }
  return i;
}

#define FUNCTION "(function()end)();"

static const char *reader(lua_State *L, void *ud, size_t *size)
{
  UNUSED(L);
  if ((*(int *)ud)--)
  {
    *size = sizeof(FUNCTION) - 1;
    return FUNCTION;
  }
  else
  {
    *size = 0;
    return NULL;
  }
}

#define toproto(L, i) getproto(L->top + (i))

static const Proto *combine(lua_State *L, int n)
{
  if (n == 1)
    return toproto(L, -1);
  else
  {
    Proto *f;
    int i = n;
    if (lua_load(L, reader, &i, "=(" PROGNAME ")", NULL) != LUA_OK)
      fatal(lua_tostring(L, -1));
    f = toproto(L, -1);
    for (i = 0; i < n; i++)
    {
      f->p[i] = toproto(L, i - n - 1);
      if (f->p[i]->sizeupvalues > 0)
        f->p[i]->upvalues[0].instack = 0;
    }
    f->sizelineinfo = 0;
    return f;
  }
}

static int writer(lua_State *L, const void *p, size_t size, void *u)
{
  UNUSED(L);
  return (fwrite(p, size, 1, (FILE *)u) != 1) && (size != 0);
}

static int pmain(lua_State *L)
{
  int argc = (int)lua_tointeger(L, 1);
  char **argv = (char **)lua_touserdata(L, 2);
  const Proto *f;
  int i;
  if (!lua_checkstack(L, argc))
    fatal("too many input files");
  for (i = 0; i < argc; i++)
  {
    const char *filename = IS("-") ? NULL : argv[i];
    if (luaL_loadfile(L, filename) != LUA_OK)
      fatal(lua_tostring(L, -1));
  }
  f = combine(L, argc);
  if (listing)
    luaU_print(f, listing > 1);
  if (dumping)
  {
    FILE *D = (output == NULL) ? stdout : fopen(output, "wb");
    if (D == NULL)
      cannot("open");
    lua_lock(L);
    luaU_dump(L, f, writer, D, stripping);
    lua_unlock(L);
    if (ferror(D))
      cannot("write");
    if (fclose(D))
      cannot("close");
  }
  return 0;
}

int main(int argc, char *argv[])
{
  lua_State *L;
  int i = doargs(argc, argv);
  argc -= i;
  argv += i;
  if (argc <= 0)
    usage("no input files given");
  L = luaL_newstate();
  if (L == NULL)
    fatal("cannot create state: not enough memory");
  lua_pushcfunction(L, &pmain);
  lua_pushinteger(L, argc);
  lua_pushlightuserdata(L, argv);
  if (lua_pcall(L, 2, 0, 0) != LUA_OK)
    fatal(lua_tostring(L, -1));
  lua_close(L);
  return EXIT_SUCCESS;
}

/*
** $Id: luac.c,v 1.76 2018/06/19 01:32:02 lhf Exp $
** print bytecodes
** See Copyright Notice in lua.h
*/

#include <ctype.h>
#include <stdio.h>

#define luac_c
#define LUA_CORE

#include "ldebug.h"
#include "lobject.h"
#include "lopcodes.h"

#define VOID(p) ((const void *)(p))

static void PrintString(const TString *ts)
{
  const char *s = getstr(ts);
  size_t i, n = tsslen(ts);
  printf("%c", '"');
  for (i = 0; i < n; i++)
  {
    int c = (int)(unsigned char)s[i];
    switch (c)
    {
    case '"':
      printf("\\\"");
      break;
    case '\\':
      printf("\\\\");
      break;
    case '\a':
      printf("\\a");
      break;
    case '\b':
      printf("\\b");
      break;
    case '\f':
      printf("\\f");
      break;
    case '\n':
      printf("\\n");
      break;
    case '\r':
      printf("\\r");
      break;
    case '\t':
      printf("\\t");
      break;
    case '\v':
      printf("\\v");
      break;
    default:
      if (isprint(c))
        printf("%c", c);
      else
        printf("\\%03d", c);
    }
  }
  printf("%c", '"');
}

static void PrintConstant(const Proto *f, int i)
{
  const TValue *o = &f->k[i];
  switch (ttype(o))
  {
  case LUA_TNIL:
    printf("nil");
    break;
  case LUA_TBOOLEAN:
    printf(bvalue(o) ? "true" : "false");
    break;
  case LUA_TNUMFLT:
  {
    char buff[100];
    sprintf(buff, LUA_NUMBER_FMT, fltvalue(o));
    printf("%s", buff);
    if (buff[strspn(buff, "-0123456789")] == '\0')
      printf(".0");
    break;
  }
  case LUA_TNUMINT:
    printf(LUA_INTEGER_FMT, ivalue(o));
    break;
  case LUA_TSHRSTR:
  case LUA_TLNGSTR:
    PrintString(tsvalue(o));
    break;
  default: /* cannot happen */
    printf("? type=%d", ttype(o));
    break;
  }
}

#define UPVALNAME(x) ((f->upvalues[x].name) ? getstr(f->upvalues[x].name) : "-")
#define MYK(x) (-1 - (x))

static void PrintCode(const Proto *f)
{
  const Instruction *code = f->code;
  int pc, n = f->sizecode;
  for (pc = 0; pc < n; pc++)
  {
    Instruction i = code[pc];
    OpCode o = GET_OPCODE(i);
    int a = GETARG_A(i);
    int b = GETARG_B(i);
    int c = GETARG_C(i);
    int ax = GETARG_Ax(i);
    int bx = GETARG_Bx(i);
    int sbx = GETARG_sBx(i);
    int line = getfuncline(f, pc);
    printf("\t%d\t", pc + 1);
    if (line > 0)
      printf("[%d]\t", line);
    else
      printf("[-]\t");
    printf("%-9s\t", luaP_opnames[o]);
    switch (getOpMode(o))
    {
    case iABC:
      printf("%d", a);
      if (getBMode(o) != OpArgN)
        printf(" %d", ISK(b) ? (MYK(INDEXK(b))) : b);
      if (getCMode(o) != OpArgN)
        printf(" %d", ISK(c) ? (MYK(INDEXK(c))) : c);
      break;
    case iABx:
      printf("%d", a);
      if (getBMode(o) == OpArgK)
        printf(" %d", MYK(bx));
      if (getBMode(o) == OpArgU)
        printf(" %d", bx);
      break;
    case iAsBx:
      printf("%d %d", a, sbx);
      break;
    case iAx:
      printf("%d", MYK(ax));
      break;
    }
    switch (o)
    {
    case OP_LOADK:
      printf("\t; ");
      PrintConstant(f, bx);
      break;
    case OP_GETUPVAL:
    case OP_SETUPVAL:
      printf("\t; %s", UPVALNAME(b));
      break;
    case OP_GETTABUP:
      printf("\t; %s", UPVALNAME(b));
      if (ISK(c))
      {
        printf(" ");
        PrintConstant(f, INDEXK(c));
      }
      break;
    case OP_SETTABUP:
      printf("\t; %s", UPVALNAME(a));
      if (ISK(b))
      {
        printf(" ");
        PrintConstant(f, INDEXK(b));
      }
      if (ISK(c))
      {
        printf(" ");
        PrintConstant(f, INDEXK(c));
      }
      break;
    case OP_GETTABLE:
    case OP_SELF:
      if (ISK(c))
      {
        printf("\t; ");
        PrintConstant(f, INDEXK(c));
      }
      break;
    case OP_SETTABLE:
    case OP_ADD:
    case OP_SUB:
    case OP_MUL:
    case OP_MOD:
    case OP_POW:
    case OP_DIV:
    case OP_IDIV:
    case OP_BAND:
    case OP_BOR:
    case OP_BXOR:
    case OP_SHL:
    case OP_SHR:
    case OP_EQ:
    case OP_LT:
    case OP_LE:
      if (ISK(b) || ISK(c))
      {
        printf("\t; ");
        if (ISK(b))
          PrintConstant(f, INDEXK(b));
        else
          printf("-");
        printf(" ");
        if (ISK(c))
          PrintConstant(f, INDEXK(c));
        else
          printf("-");
      }
      break;
    case OP_JMP:
    case OP_FORLOOP:
    case OP_FORPREP:
    case OP_TFORLOOP:
      printf("\t; to %d", sbx + pc + 2);
      break;
    case OP_CLOSURE:
      printf("\t; %p", VOID(f->p[bx]));
      break;
    case OP_SETLIST:
      if (c == 0)
        printf("\t; %d", (int)code[++pc]);
      else
        printf("\t; %d", c);
      break;
    case OP_EXTRAARG:
      printf("\t; ");
      PrintConstant(f, ax);
      break;
    default:
      break;
    }
    printf("\n");
  }
}

#define SS(x) ((x == 1) ? "" : "s")
#define S(x) (int)(x), SS(x)

static void PrintHeader(const Proto *f)
{
  const char *s = f->source ? getstr(f->source) : "=?";
  if (*s == '@' || *s == '=')
    s++;
  else if (*s == LUA_SIGNATURE[0])
    s = "(bstring)";
  else
    s = "(string)";
  printf("\n%s <%s:%d,%d> (%d instruction%s at %p)\n",
         (f->linedefined == 0) ? "main" : "function", s,
         f->linedefined, f->lastlinedefined,
         S(f->sizecode), VOID(f));
  printf("%d%s param%s, %d slot%s, %d upvalue%s, ",
         (int)(f->numparams), f->is_vararg ? "+" : "", SS(f->numparams),
         S(f->maxstacksize), S(f->sizeupvalues));
  printf("%d local%s, %d constant%s, %d function%s\n",
         S(f->sizelocvars), S(f->sizek), S(f->sizep));
}

static void PrintDebug(const Proto *f)
{
  int i, n;
  n = f->sizek;
  printf("constants (%d) for %p:\n", n, VOID(f));
  for (i = 0; i < n; i++)
  {
    printf("\t%d\t", i + 1);
    PrintConstant(f, i);
    printf("\n");
  }
  n = f->sizelocvars;
  printf("locals (%d) for %p:\n", n, VOID(f));
  for (i = 0; i < n; i++)
  {
    printf("\t%d\t%s\t%d\t%d\n",
           i, getstr(f->locvars[i].varname), f->locvars[i].startpc + 1, f->locvars[i].endpc + 1);
  }
  n = f->sizeupvalues;
  printf("upvalues (%d) for %p:\n", n, VOID(f));
  for (i = 0; i < n; i++)
  {
    printf("\t%d\t%s\t%d\t%d\n",
           i, UPVALNAME(i), f->upvalues[i].instack, f->upvalues[i].idx);
  }
}

static void PrintFunction(const Proto *f, int full)
{
  int i, n = f->sizep;
  PrintHeader(f);
  PrintCode(f);
  if (full)
    PrintDebug(f);
  for (i = 0; i < n; i++)
    PrintFunction(f->p[i], full);
}
